Pump.



R. o. DAWSON. PUMP.

APPLICATION FILED DEO.29, 1911.

1,029,9'??, Patented June 18, 1912.

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1,029,977. Patented June 18, 1912.

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1. .pumping water, but applicable to UNITED STATES PA and ROBERT C. DAWSON, OF EAST MQKEESPORT, PENNSYLVANIA, ASSIGNOE 0F ONE-THIRD TO THOMAS F. WILEY' AND ONE-THIRD T0 LEWIS N. MORGAN, BOTH 0F MOKEES- PORT, PENNSYLVANIA.

PUMP.

Specification of Letters Patent.

Patentedelune 18, 1912.

Application filed December 29, 1911. Serial No. 868,506.

the following is a specification. r

My invention consists in. a new and improved rotary suction pump intended for umping other liquids or fluids, as may e desired. I

Generally speaking, the pump is composed of a cylindraceous casing provided with opposing inlet and outlet ports, the 1nlet port being preferably of less capacity than the outlet port.- Eccentrically mounted in said chamber and havi' its perimeter substantially incontact with the perimeter of said casing between said ports is a rotary cylindrical drum in which is slidingly mounted a blade of sufficientv length to span the casing leaving a slight interval between its ends and the perimeter of the casing, for instance a sixty-fourth of an inch at either end of the blade, and of suflicient width to fit between the front and rear walls of the casing. The space between the ends and side edges of the blade and the casing, when the blade is rotated, is filled with water, forming an effectual water-seal whereby suction efliciency is maintained. Ports are provided for the admission of the water into the interior of the drum where it acts upon vanes fixed on the blade, cushioning the longitudinal movement of the blade and preventing its impact against the perimeter of the casing,

thus maintaining the water-seal and preventingthe wearing away of the ends of the blade.

I Other novel features of construction and arrangement will appear from the following description.

In the accompanying drawings, Figure 1 is a vertical section on the line II in Fig. 2; Fig. 2' is a vertical section on the line II-II in Fig. 1, the blade being omitted for the sake of clearness, and Fig. 3 is a side elevation of the blade dismounted.

The following is a detailed description of the drawings:

1 is the casing having a oylindraceous bore and a fixed -end wall 2. The other end wall is composed ofa removable plate 3 which is attachable by an air-tight con- 'nection.

4 is the inlet port at one side of the vertical axis of the casing and 5 is the outlet port on the other side of said axis, the outlet port being preferably of greater capacity than the inlet port.

6 is a driving shaft mounted in the journal box 7 integral with or mounted on the wall 2 of the casing, and provided with a pulley 8. The shaft'fi passes'through a stufling box 7 in the wall'2 and is eccentric to said wall, preferably below the horizontal axis thereof.

9 is a circular seat in the inner surface of wall 2 concentric with the shaft 6.

10 is a cylindrical drum within the casingl. The drum 10 has one'closed end, 11, which is seated in seat 9 and concentrically mounted onthe end of shaft 6 to rotate therewith. The perimeter of. drum 10 is in light rotary contact with the perimeter of the casing 1 between the ports 4 and 5. The other end of drum 10 is preferably open and said drum is provided in its perimeter with two longitudinal slots 1212 extending from its open end to the closed end 11. Inasmuch as the end 11 of said drum is contained inseat 9, said slots 1212 extend the full width of the interior of the casing.

13 is a blade slidingly mounted in slots 12-12 of .the drum 10 and spanning the interior of the casing 1. The ends of said blade, however, do not contact with the perimeter of the casing but a slight space or interval is left between the same at either end of the blade. The blade 13 is of sufiicient Width to fillthe space between the end walls 2 and 3 of the casing with sufiicient play to rotate easily with the drum.

14-14 are a pair-of small ports through the perimeter of drum 10 adjacent to the slots 12-12, and in advance of the blade 13 in the direction of rotation, which is clockwise in the drawings.

1515 are a pair of oppositely curved vanes fixed, on either side ofthe blade 13 at the longitudinal center thereof, each vane being curved toward the port 14 on the same side of blade 13 and being preferably of a length equal to the shortest distance between the longitudinal center of the blade and the perimeter of the drum.

16-16 are concentric and co-acting an-. nular recesses and projections on the end Wall 11 of drum 10 and the inner face of wall 2 of easing 1, which, when the pump is in operation, form. a water-seal to prevent the escape of water from the casing or the entrance of air from without.

In pumping water, the operation of my device is as'follows: The shaft 6 is rotated, causing the drum 10 and the blade 13 to revolve, the blade sliding in said drum to accommodate itself to the perimeter of the casing 1. In designing the casing, its horizontal diameter through the axis of the drum 10 is preferably equal to its vertical diameter through the same point. The water drawn in through the port 4; forms an aqueous sheet or lining on the perimeter of the casing which fills the space between the ends of the blade and the perimeter of the casing and also fills the space between the side edges 'of the blade and the side walls of the casing. A water-seal is also formed between the perimeter of the drum and the casing. The water entering between the Wall 2 of the casing and theend wall 11 of the drum 10 forms a water-seal in seat 9 thus preventing air from entering between such elements. I thus obtain a perfect seal between the two chambers formed by the blade spanning the casing and the full suction ,force of the rotating blade is made effectual and preserved.

The tendency of centrifugal force upon the blade 12 is, of course, to throw it outward toward the casing 1, which would cause said blade tocontact with said casing; butthis centrifugal action is, with my construction, resisted, balanced and offset in the following manner: The water enters (in the position of the parts shown in Fig. 1) the port 14 on the side of the blade toward the outlet-port 5 (the discharge pressure of a pump being eater than the pressure in the suction-cham er thereof) and presses down upon the vane 15 on that side of the blade.

At the same time, of'course, the water in the rotor 10, on the other sidevof the blade 12, acts as a drag upon the vane 15 on this said other side, assisting in overcoming the tendency of the blade 12 to move outward by centrifugal action, as above referred to, By this means the movement of the blade 13 is cushioned so that its ends will not be impacted against the perimeter of the casing 1,

but will be balanced or held with its ends out of contact with said perimeter, thus preventing the wearing away of the ends of the blades and preserving the water-seal between the perimeter of the casing and'said 7 blade. 3

The suction obtained is the full effect of the rotation of the blade 13, since the waterseal obtained prevents the entrance of air into the casing or its passage from one side i' ning the two its vacuum,

of the blade 13 to the other, so that the full suction force is utilized in drawing in the water throu h the port 4, It has been found in practice t at the outlet port must be made tion. This is entirely obviated by the provision of the vanes co-acting with the water ports in drum 10, a test of fifty hours showing no wear on the ends of the blade, the file marks being clearly. visible To prevent the blade in its rotation spanports 4 and 5 and thus losing said ports are located, as shown, so that a line drawn from the top of one port to the top of the other port will intersect the vertical diameter of the drum 10 below the center of said drum so that the one end of the blade will pass above the port 4 before the other end of the blade in its downward movement reaches thetop of port 5. It is advantageous to bring the port 5 as near the bottom of the drum 10 as possible so that the full throw discharge water through said port 5.

What I claim is,: a

1. In a pump, a casing having a cylindraceous bore and provided with an inlet port and an outlet port, a rotary drum eccentrically mounted in said casing and'having its perimeter bearing upon the perimeter of said casing between said ports, a blade slidingly mounted in said drum and rotating therewith, means for admitting water to said drum, and means co-acting with the water insaid drum for maintaining the ends of said blade out of contact with the perimeter of said casing while said blade is rotating. v

2. In a pump, a casing having a cylindraceous bore and provided with an inlet port and an outlet port, a rotary water con- -taining drum eccentrically mounted in said casing and having its perimeter bearing upon the perimeter of said casing between of the blade will be exerted to said ports, a blade slidingly mounted in said drum and rotating therewith, and members mounted on said blade within said drum and co-acting with said water to maintain the ends of said blade out of contact with the perimeter of said casing while said blade isrotating.

3. In a pump, a casing having a cylindraceous'bore and provided with an inlet port and an outlet port, a rotary drum eccentrically mounted in said casing and having its perimeter bearing upon the perimeter of said casing between said ports, said drum being provided with ports for the admission of water into the interior thereof, a blade slidingly mounted in said drum and rotating therewith, and vanes mounted on said blade within said drum and co-acting with the water in the latter to maintain the ends of said drum out of contact with the perimeter of said casing while said blade isrotating.

4. Ina pump, a cylindraceous casing provided with an inlet port and an outlet port, a water filled drum eccentrically mounted in said casing and having its perimeter bearing upon the perimeter of said casing between said ports, a blade slidingly mounted in said drum and rotating therewith, vanes curved in opposite directions fixed on opposite sides of said blade adapted to be acted upon by the water in said drum to cushion the movement of said blade, and means for rotating said drum.

5. In a pump, a casing provided with an inlet and outlet port, a water-containing drum revoluble within said casing, a blade slidingly carried by and movable with said drum and projecting thereinto, and means disposed within said drum and co-acting with the water therein for overcoming centrifugal force upon said blade.

6. In a pump, a casing provided with an inlet and outlet port, a water-containing drum revoluble within said ca 'ng, a blade slidingly carried by and movab e with said drum and projecting thereinto, and means disposed within said drum and carried by said blade and co-acting with the water in the drum for overcoming centrifugal force upon said blade.

Signed at McKeesport, Pa, this 27th day of December, 1911.

ROBERT C. DAWSON.

Witnesses WlLLIAM E. OToonn, ISRAEL A. SIMON. 

